initial commit

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+### Vim template
+# Swap
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+*~
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~
+
+### macOS template
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Go template
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+.idea

cmd/getaoc/main.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+
+	"code.chrissexton.org/cws/getaoc"
+)
+
+var year = flag.Int("year", 2019, "event year")
+var sessId = flag.String("session", "", "session id")
+var file = flag.String("file", "input.txt", "filename (- for stdout)")
+
+const base = "https://adventofcode.com"
+
+func main() {
+	flag.Parse()
+	if flag.NArg() < 1 {
+		fmt.Fprintln(os.Stderr, "Error: Must provide a day argument.")
+		return
+	}
+	day, _ := strconv.Atoi(flag.Arg(0))
+
+	sess, ok := os.LookupEnv("AOC_SESSION")
+	if !ok && *sessId == "" {
+		fmt.Fprintln(os.Stderr, "Error: Must provide a session id.")
+		return
+	}
+
+	if *sessId != "" {
+		sess = *sessId
+	}
+
+	body := getaoc.GetInput(sess, *year, day)
+
+	if *file == "-" {
+		fmt.Println(body)
+	} else {
+		f, err := os.Create(*file)
+		if err != nil {
+			panic(err)
+		}
+		defer f.Close()
+		fmt.Fprint(f, body)
+	}
+}

getaoc.go

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+package getaoc
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+)
+
+const base = "https://adventofcode.com"
+
+func GetInput(session string, year, day int) string {
+	url := fmt.Sprintf("%s/%d/day/%d/input", base, year, day)
+
+	r, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		panic(err)
+	}
+	r.AddCookie(&http.Cookie{
+		Name:       "session",
+		Value:      session,
+		Path:       "",
+		Domain:     ".adventofcode.com",
+		Secure:     false,
+		HttpOnly:   false,
+		SameSite:   0,
+	})
+	c := http.Client{}
+	resp, err := c.Do(r)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer resp.Body.Close()
+	body, _ := ioutil.ReadAll(resp.Body)
+	return string(body)
+}

go.mod

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+module code.chrissexton.org/cws/getaoc
+
+go 1.13